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Current Caliber none
Caliber
Current Gas Port Position none
Gas Port Position
Current Gas Block none
Current Gas Block
Current Brass Deflector none
Current Brass Deflector
New Caliber none
New Caliber
New Barrel Length none
New Barrel Length
New Barrel Contour none
New Barrel Contour
New Gas Block none
New Gas Block
New Barrel Twist none
New Barrel Twist
New Muzzle Device none
New Muzzle Device
Brass Deflector none
Brass Deflector
Total: